1 files changed, 1075 insertions, 0 deletions

diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
new file mode 100644
index 000000000000..f6e621684953
--- /dev/null
+++ b/drivers/video/fbdev/imxfb.c
@@ -0,0 +1,1075 @@
+/*
+ *  Freescale i.MX Frame Buffer device driver
+ *
+ *  Copyright (C) 2004 Sascha Hauer, Pengutronix
+ *   Based on acornfb.c Copyright (C) Russell King.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Please direct your questions and comments on this driver to the following
+ * email address:
+ *
+ *      linux-arm-kernel@lists.arm.linux.org.uk
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/cpufreq.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/lcd.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <linux/regulator/consumer.h>
+
+#include <video/of_display_timing.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <linux/platform_data/video-imxfb.h>
+
+/*
+ * Complain if VAR is out of range.
+ */
+#define DEBUG_VAR 1
+
+#define DRIVER_NAME "imx-fb"
+
+#define LCDC_SSA        0x00
+
+#define LCDC_SIZE       0x04
+#define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
+
+#define YMAX_MASK_IMX1  0x1ff
+#define YMAX_MASK_IMX21 0x3ff
+
+#define LCDC_VPW        0x08
+#define VPW_VPW(x)      ((x) & 0x3ff)
+
+#define LCDC_CPOS       0x0C
+#define CPOS_CC1        (1<<31)
+#define CPOS_CC0        (1<<30)
+#define CPOS_OP         (1<<28)
+#define CPOS_CXP(x)     (((x) & 3ff) << 16)
+
+#define LCDC_LCWHB      0x10
+#define LCWHB_BK_EN     (1<<31)
+#define LCWHB_CW(w)     (((w) & 0x1f) << 24)
+#define LCWHB_CH(h)     (((h) & 0x1f) << 16)
+#define LCWHB_BD(x)     ((x) & 0xff)
+
+#define LCDC_LCHCC      0x14
+
+#define LCDC_PCR        0x18
+
+#define LCDC_HCR        0x1C
+#define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
+#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
+#define HCR_H_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_VCR        0x20
+#define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
+#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
+#define VCR_V_WAIT_2(x) ((x) & 0xff)
+
+#define LCDC_POS        0x24
+#define POS_POS(x)      ((x) & 1f)
+
+#define LCDC_LSCR1      0x28
+/* bit fields in imxfb.h */
+
+#define LCDC_PWMR       0x2C
+/* bit fields in imxfb.h */
+
+#define LCDC_DMACR      0x30
+/* bit fields in imxfb.h */
+
+#define LCDC_RMCR       0x34
+
+#define RMCR_LCDC_EN_MX1        (1<<1)
+
+#define RMCR_SELF_REF   (1<<0)
+
+#define LCDC_LCDICR     0x38
+#define LCDICR_INT_SYN  (1<<2)
+#define LCDICR_INT_CON  (1)
+
+#define LCDC_LCDISR     0x40
+#define LCDISR_UDR_ERR  (1<<3)
+#define LCDISR_ERR_RES  (1<<2)
+#define LCDISR_EOF      (1<<1)
+#define LCDISR_BOF      (1<<0)
+
+#define IMXFB_LSCR1_DEFAULT 0x00120300
+
+/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
+static const char *fb_mode;
+
+/*
+ * These are the bitfields for each
+ * display depth that we support.
+ */
+struct imxfb_rgb {
+        struct fb_bitfield      red;
+        struct fb_bitfield      green;
+        struct fb_bitfield      blue;
+        struct fb_bitfield      transp;
+};
+
+enum imxfb_type {
+        IMX1_FB,
+        IMX21_FB,
+};
+
+struct imxfb_info {
+        struct platform_device  *pdev;
+        void __iomem            *regs;
+        struct clk              *clk_ipg;
+        struct clk              *clk_ahb;
+        struct clk              *clk_per;
+        enum imxfb_type         devtype;
+        bool                    enabled;
+
+        /*
+         * These are the addresses we mapped
+         * the framebuffer memory region to.
+         */
+        dma_addr_t              map_dma;
+        u_int                   map_size;
+
+        u_int                   palette_size;
+
+        dma_addr_t              dbar1;
+        dma_addr_t              dbar2;
+
+        u_int                   pcr;
+        u_int                   pwmr;
+        u_int                   lscr1;
+        u_int                   dmacr;
+        bool                    cmap_inverse;
+        bool                    cmap_static;
+
+        struct imx_fb_videomode *mode;
+        int                     num_modes;
+
+        struct regulator        *lcd_pwr;
+};
+
+static struct platform_device_id imxfb_devtype[] = {
+        {
+                .name = "imx1-fb",
+                .driver_data = IMX1_FB,
+        }, {
+                .name = "imx21-fb",
+                .driver_data = IMX21_FB,
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(platform, imxfb_devtype);
+
+static struct of_device_id imxfb_of_dev_id[] = {
+        {
+                .compatible = "fsl,imx1-fb",
+                .data = &imxfb_devtype[IMX1_FB],
+        }, {
+                .compatible = "fsl,imx21-fb",
+                .data = &imxfb_devtype[IMX21_FB],
+        }, {
+                /* sentinel */
+        }
+};
+MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
+
+static inline int is_imx1_fb(struct imxfb_info *fbi)
+{
+        return fbi->devtype == IMX1_FB;
+}
+
+#define IMX_NAME        "IMX"
+
+/*
+ * Minimum X and Y resolutions
+ */
+#define MIN_XRES        64
+#define MIN_YRES        64
+
+/* Actually this really is 18bit support, the lowest 2 bits of each colour
+ * are unused in hardware. We claim to have 24bit support to make software
+ * like X work, which does not support 18bit.
+ */
+static struct imxfb_rgb def_rgb_18 = {
+        .red    = {.offset = 16, .length = 8,},
+        .green  = {.offset = 8, .length = 8,},
+        .blue   = {.offset = 0, .length = 8,},
+        .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_16_tft = {
+        .red    = {.offset = 11, .length = 5,},
+        .green  = {.offset = 5, .length = 6,},
+        .blue   = {.offset = 0, .length = 5,},
+        .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_16_stn = {
+        .red    = {.offset = 8, .length = 4,},
+        .green  = {.offset = 4, .length = 4,},
+        .blue   = {.offset = 0, .length = 4,},
+        .transp = {.offset = 0, .length = 0,},
+};
+
+static struct imxfb_rgb def_rgb_8 = {
+        .red    = {.offset = 0, .length = 8,},
+        .green  = {.offset = 0, .length = 8,},
+        .blue   = {.offset = 0, .length = 8,},
+        .transp = {.offset = 0, .length = 0,},
+};
+
+static int imxfb_activate_var(struct fb_var_screeninfo *var,
+                struct fb_info *info);
+
+static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
+{
+        chan &= 0xffff;
+        chan >>= 16 - bf->length;
+        return chan << bf->offset;
+}
+
+static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
+                u_int trans, struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+        u_int val, ret = 1;
+
+#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
+        if (regno < fbi->palette_size) {
+                val = (CNVT_TOHW(red, 4) << 8) |
+                      (CNVT_TOHW(green,4) << 4) |
+                      CNVT_TOHW(blue,  4);
+
+                writel(val, fbi->regs + 0x800 + (regno << 2));
+                ret = 0;
+        }
+        return ret;
+}
+
+static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                   u_int trans, struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+        unsigned int val;
+        int ret = 1;
+
+        /*
+         * If inverse mode was selected, invert all the colours
+         * rather than the register number.  The register number
+         * is what you poke into the framebuffer to produce the
+         * colour you requested.
+         */
+        if (fbi->cmap_inverse) {
+                red   = 0xffff - red;
+                green = 0xffff - green;
+                blue  = 0xffff - blue;
+        }
+
+        /*
+         * If greyscale is true, then we convert the RGB value
+         * to greyscale no mater what visual we are using.
+         */
+        if (info->var.grayscale)
+                red = green = blue = (19595 * red + 38470 * green +
+                                        7471 * blue) >> 16;
+
+        switch (info->fix.visual) {
+        case FB_VISUAL_TRUECOLOR:
+                /*
+                 * 12 or 16-bit True Colour.  We encode the RGB value
+                 * according to the RGB bitfield information.
+                 */
+                if (regno < 16) {
+                        u32 *pal = info->pseudo_palette;
+
+                        val  = chan_to_field(red, &info->var.red);
+                        val |= chan_to_field(green, &info->var.green);
+                        val |= chan_to_field(blue, &info->var.blue);
+
+                        pal[regno] = val;
+                        ret = 0;
+                }
+                break;
+
+        case FB_VISUAL_STATIC_PSEUDOCOLOR:
+        case FB_VISUAL_PSEUDOCOLOR:
+                ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
+                break;
+        }
+
+        return ret;
+}
+
+static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
+{
+        struct imx_fb_videomode *m;
+        int i;
+
+        if (!fb_mode)
+                return &fbi->mode[0];
+
+        for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
+                if (!strcmp(m->mode.name, fb_mode))
+                        return m;
+        }
+        return NULL;
+}
+
+/*
+ *  imxfb_check_var():
+ *    Round up in the following order: bits_per_pixel, xres,
+ *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
+ *    bitfields, horizontal timing, vertical timing.
+ */
+static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+        struct imxfb_rgb *rgb;
+        const struct imx_fb_videomode *imxfb_mode;
+        unsigned long lcd_clk;
+        unsigned long long tmp;
+        u32 pcr = 0;
+
+        if (var->xres < MIN_XRES)
+                var->xres = MIN_XRES;
+        if (var->yres < MIN_YRES)
+                var->yres = MIN_YRES;
+
+        imxfb_mode = imxfb_find_mode(fbi);
+        if (!imxfb_mode)
+                return -EINVAL;
+
+        var->xres               = imxfb_mode->mode.xres;
+        var->yres               = imxfb_mode->mode.yres;
+        var->bits_per_pixel     = imxfb_mode->bpp;
+        var->pixclock           = imxfb_mode->mode.pixclock;
+        var->hsync_len          = imxfb_mode->mode.hsync_len;
+        var->left_margin        = imxfb_mode->mode.left_margin;
+        var->right_margin       = imxfb_mode->mode.right_margin;
+        var->vsync_len          = imxfb_mode->mode.vsync_len;
+        var->upper_margin       = imxfb_mode->mode.upper_margin;
+        var->lower_margin       = imxfb_mode->mode.lower_margin;
+        var->sync               = imxfb_mode->mode.sync;
+        var->xres_virtual       = max(var->xres_virtual, var->xres);
+        var->yres_virtual       = max(var->yres_virtual, var->yres);
+
+        pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
+
+        lcd_clk = clk_get_rate(fbi->clk_per);
+
+        tmp = var->pixclock * (unsigned long long)lcd_clk;
+
+        do_div(tmp, 1000000);
+
+        if (do_div(tmp, 1000000) > 500000)
+                tmp++;
+
+        pcr = (unsigned int)tmp;
+
+        if (--pcr > 0x3F) {
+                pcr = 0x3F;
+                printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
+                                lcd_clk / pcr);
+        }
+
+        switch (var->bits_per_pixel) {
+        case 32:
+                pcr |= PCR_BPIX_18;
+                rgb = &def_rgb_18;
+                break;
+        case 16:
+        default:
+                if (is_imx1_fb(fbi))
+                        pcr |= PCR_BPIX_12;
+                else
+                        pcr |= PCR_BPIX_16;
+
+                if (imxfb_mode->pcr & PCR_TFT)
+                        rgb = &def_rgb_16_tft;
+                else
+                        rgb = &def_rgb_16_stn;
+                break;
+        case 8:
+                pcr |= PCR_BPIX_8;
+                rgb = &def_rgb_8;
+                break;
+        }
+
+        /* add sync polarities */
+        pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
+
+        fbi->pcr = pcr;
+
+        /*
+         * Copy the RGB parameters for this display
+         * from the machine specific parameters.
+         */
+        var->red    = rgb->red;
+        var->green  = rgb->green;
+        var->blue   = rgb->blue;
+        var->transp = rgb->transp;
+
+        pr_debug("RGBT length = %d:%d:%d:%d\n",
+                var->red.length, var->green.length, var->blue.length,
+                var->transp.length);
+
+        pr_debug("RGBT offset = %d:%d:%d:%d\n",
+                var->red.offset, var->green.offset, var->blue.offset,
+                var->transp.offset);
+
+        return 0;
+}
+
+/*
+ * imxfb_set_par():
+ *      Set the user defined part of the display for the specified console
+ */
+static int imxfb_set_par(struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+        struct fb_var_screeninfo *var = &info->var;
+
+        if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
+                info->fix.visual = FB_VISUAL_TRUECOLOR;
+        else if (!fbi->cmap_static)
+                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+        else {
+                /*
+                 * Some people have weird ideas about wanting static
+                 * pseudocolor maps.  I suspect their user space
+                 * applications are broken.
+                 */
+                info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
+        }
+
+        info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
+        fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
+
+        imxfb_activate_var(var, info);
+
+        return 0;
+}
+
+static void imxfb_enable_controller(struct imxfb_info *fbi)
+{
+
+        if (fbi->enabled)
+                return;
+
+        pr_debug("Enabling LCD controller\n");
+
+        writel(fbi->map_dma, fbi->regs + LCDC_SSA);
+
+        /* panning offset 0 (0 pixel offset)        */
+        writel(0x00000000, fbi->regs + LCDC_POS);
+
+        /* disable hardware cursor */
+        writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
+                fbi->regs + LCDC_CPOS);
+
+        /*
+         * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
+         * on other SoCs
+         */
+        writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
+
+        clk_prepare_enable(fbi->clk_ipg);
+        clk_prepare_enable(fbi->clk_ahb);
+        clk_prepare_enable(fbi->clk_per);
+        fbi->enabled = true;
+}
+
+static void imxfb_disable_controller(struct imxfb_info *fbi)
+{
+        if (!fbi->enabled)
+                return;
+
+        pr_debug("Disabling LCD controller\n");
+
+        clk_disable_unprepare(fbi->clk_per);
+        clk_disable_unprepare(fbi->clk_ipg);
+        clk_disable_unprepare(fbi->clk_ahb);
+        fbi->enabled = false;
+
+        writel(0, fbi->regs + LCDC_RMCR);
+}
+
+static int imxfb_blank(int blank, struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+
+        pr_debug("imxfb_blank: blank=%d\n", blank);
+
+        switch (blank) {
+        case FB_BLANK_POWERDOWN:
+        case FB_BLANK_VSYNC_SUSPEND:
+        case FB_BLANK_HSYNC_SUSPEND:
+        case FB_BLANK_NORMAL:
+                imxfb_disable_controller(fbi);
+                break;
+
+        case FB_BLANK_UNBLANK:
+                imxfb_enable_controller(fbi);
+                break;
+        }
+        return 0;
+}
+
+static struct fb_ops imxfb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_check_var   = imxfb_check_var,
+        .fb_set_par     = imxfb_set_par,
+        .fb_setcolreg   = imxfb_setcolreg,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+        .fb_blank       = imxfb_blank,
+};
+
+/*
+ * imxfb_activate_var():
+ *      Configures LCD Controller based on entries in var parameter.  Settings are
+ *      only written to the controller if changes were made.
+ */
+static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+        struct imxfb_info *fbi = info->par;
+        u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
+
+        pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
+                var->xres, var->hsync_len,
+                var->left_margin, var->right_margin);
+        pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
+                var->yres, var->vsync_len,
+                var->upper_margin, var->lower_margin);
+
+#if DEBUG_VAR
+        if (var->xres < 16        || var->xres > 1024)
+                printk(KERN_ERR "%s: invalid xres %d\n",
+                        info->fix.id, var->xres);
+        if (var->hsync_len < 1    || var->hsync_len > 64)
+                printk(KERN_ERR "%s: invalid hsync_len %d\n",
+                        info->fix.id, var->hsync_len);
+        if (var->left_margin > 255)
+                printk(KERN_ERR "%s: invalid left_margin %d\n",
+                        info->fix.id, var->left_margin);
+        if (var->right_margin > 255)
+                printk(KERN_ERR "%s: invalid right_margin %d\n",
+                        info->fix.id, var->right_margin);
+        if (var->yres < 1 || var->yres > ymax_mask)
+                printk(KERN_ERR "%s: invalid yres %d\n",
+                        info->fix.id, var->yres);
+        if (var->vsync_len > 100)
+                printk(KERN_ERR "%s: invalid vsync_len %d\n",
+                        info->fix.id, var->vsync_len);
+        if (var->upper_margin > 63)
+                printk(KERN_ERR "%s: invalid upper_margin %d\n",
+                        info->fix.id, var->upper_margin);
+        if (var->lower_margin > 255)
+                printk(KERN_ERR "%s: invalid lower_margin %d\n",
+                        info->fix.id, var->lower_margin);
+#endif
+
+        /* physical screen start address            */
+        writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
+                fbi->regs + LCDC_VPW);
+
+        writel(HCR_H_WIDTH(var->hsync_len - 1) |
+                HCR_H_WAIT_1(var->right_margin - 1) |
+                HCR_H_WAIT_2(var->left_margin - 3),
+                fbi->regs + LCDC_HCR);
+
+        writel(VCR_V_WIDTH(var->vsync_len) |
+                VCR_V_WAIT_1(var->lower_margin) |
+                VCR_V_WAIT_2(var->upper_margin),
+                fbi->regs + LCDC_VCR);
+
+        writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
+                        fbi->regs + LCDC_SIZE);
+
+        writel(fbi->pcr, fbi->regs + LCDC_PCR);
+        if (fbi->pwmr)
+                writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+        writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
+
+        /* dmacr = 0 is no valid value, as we need DMA control marks. */
+        if (fbi->dmacr)
+                writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
+
+        return 0;
+}
+
+static int imxfb_init_fbinfo(struct platform_device *pdev)
+{
+        struct imx_fb_platform_data *pdata = dev_get_platdata(&pdev->dev);
+        struct fb_info *info = dev_get_drvdata(&pdev->dev);
+        struct imxfb_info *fbi = info->par;
+        struct device_node *np;
+
+        pr_debug("%s\n",__func__);
+
+        info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
+        if (!info->pseudo_palette)
+                return -ENOMEM;
+
+        memset(fbi, 0, sizeof(struct imxfb_info));
+
+        fbi->devtype = pdev->id_entry->driver_data;
+
+        strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
+
+        info->fix.type                  = FB_TYPE_PACKED_PIXELS;
+        info->fix.type_aux              = 0;
+        info->fix.xpanstep              = 0;
+        info->fix.ypanstep              = 0;
+        info->fix.ywrapstep             = 0;
+        info->fix.accel                 = FB_ACCEL_NONE;
+
+        info->var.nonstd                = 0;
+        info->var.activate              = FB_ACTIVATE_NOW;
+        info->var.height                = -1;
+        info->var.width = -1;
+        info->var.accel_flags           = 0;
+        info->var.vmode                 = FB_VMODE_NONINTERLACED;
+
+        info->fbops                     = &imxfb_ops;
+        info->flags                     = FBINFO_FLAG_DEFAULT |
+                                          FBINFO_READS_FAST;
+        if (pdata) {
+                fbi->lscr1                      = pdata->lscr1;
+                fbi->dmacr                      = pdata->dmacr;
+                fbi->pwmr                       = pdata->pwmr;
+        } else {
+                np = pdev->dev.of_node;
+                info->var.grayscale = of_property_read_bool(np,
+                                                "cmap-greyscale");
+                fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
+                fbi->cmap_static = of_property_read_bool(np, "cmap-static");
+
+                fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
+
+                of_property_read_u32(np, "fsl,lpccr", &fbi->pwmr);
+
+                of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
+
+                of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
+        }
+
+        return 0;
+}
+
+static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
+                struct imx_fb_videomode *imxfb_mode)
+{
+        int ret;
+        struct fb_videomode *of_mode = &imxfb_mode->mode;
+        u32 bpp;
+        u32 pcr;
+
+        ret = of_property_read_string(np, "model", &of_mode->name);
+        if (ret)
+                of_mode->name = NULL;
+
+        ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
+        if (ret) {
+                dev_err(dev, "Failed to get videomode from DT\n");
+                return ret;
+        }
+
+        ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
+        ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
+
+        if (ret) {
+                dev_err(dev, "Failed to read bpp and pcr from DT\n");
+                return -EINVAL;
+        }
+
+        if (bpp < 1 || bpp > 255) {
+                dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
+                return -EINVAL;
+        }
+
+        imxfb_mode->bpp = bpp;
+        imxfb_mode->pcr = pcr;
+
+        return 0;
+}
+
+static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
+{
+        struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+        if (!fi || fi->par == fbi)
+                return 1;
+
+        return 0;
+}
+
+static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
+{
+        struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+        return fbi->pwmr & 0xff;
+}
+
+static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast)
+{
+        struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+        if (fbi->pwmr && fbi->enabled) {
+                if (contrast > 255)
+                        contrast = 255;
+                else if (contrast < 0)
+                        contrast = 0;
+
+                fbi->pwmr &= ~0xff;
+                fbi->pwmr |= contrast;
+
+                writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+        }
+
+        return 0;
+}
+
+static int imxfb_lcd_get_power(struct lcd_device *lcddev)
+{
+        struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+        if (!IS_ERR(fbi->lcd_pwr))
+                return regulator_is_enabled(fbi->lcd_pwr);
+
+        return 1;
+}
+
+static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
+{
+        struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
+
+        if (!IS_ERR(fbi->lcd_pwr)) {
+                if (power)
+                        return regulator_enable(fbi->lcd_pwr);
+                else
+                        return regulator_disable(fbi->lcd_pwr);
+        }
+
+        return 0;
+}
+
+static struct lcd_ops imxfb_lcd_ops = {
+        .check_fb       = imxfb_lcd_check_fb,
+        .get_contrast   = imxfb_lcd_get_contrast,
+        .set_contrast   = imxfb_lcd_set_contrast,
+        .get_power      = imxfb_lcd_get_power,
+        .set_power      = imxfb_lcd_set_power,
+};
+
+static int imxfb_setup(void)
+{
+        char *opt, *options = NULL;
+
+        if (fb_get_options("imxfb", &options))
+                return -ENODEV;
+
+        if (!options || !*options)
+                return 0;
+
+        while ((opt = strsep(&options, ",")) != NULL) {
+                if (!*opt)
+                        continue;
+                else
+                        fb_mode = opt;
+        }
+
+        return 0;
+}
+
+static int imxfb_probe(struct platform_device *pdev)
+{
+        struct imxfb_info *fbi;
+        struct lcd_device *lcd;
+        struct fb_info *info;
+        struct imx_fb_platform_data *pdata;
+        struct resource *res;
+        struct imx_fb_videomode *m;
+        const struct of_device_id *of_id;
+        int ret, i;
+        int bytes_per_pixel;
+
+        dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
+
+        ret = imxfb_setup();
+        if (ret < 0)
+                return ret;
+
+        of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
+        if (of_id)
+                pdev->id_entry = of_id->data;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
+        if (!info)
+                return -ENOMEM;
+
+        fbi = info->par;
+
+        platform_set_drvdata(pdev, info);
+
+        ret = imxfb_init_fbinfo(pdev);
+        if (ret < 0)
+                goto failed_init;
+
+        if (pdata) {
+                if (!fb_mode)
+                        fb_mode = pdata->mode[0].mode.name;
+
+                fbi->mode = pdata->mode;
+                fbi->num_modes = pdata->num_modes;
+        } else {
+                struct device_node *display_np;
+                fb_mode = NULL;
+
+                display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
+                if (!display_np) {
+                        dev_err(&pdev->dev, "No display defined in devicetree\n");
+                        ret = -EINVAL;
+                        goto failed_of_parse;
+                }
+
+                /*
+                 * imxfb does not support more modes, we choose only the native
+                 * mode.
+                 */
+                fbi->num_modes = 1;
+
+                fbi->mode = devm_kzalloc(&pdev->dev,
+                                sizeof(struct imx_fb_videomode), GFP_KERNEL);
+                if (!fbi->mode) {
+                        ret = -ENOMEM;
+                        goto failed_of_parse;
+                }
+
+                ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
+                if (ret)
+                        goto failed_of_parse;
+        }
+
+        /* Calculate maximum bytes used per pixel. In most cases this should
+         * be the same as m->bpp/8 */
+        m = &fbi->mode[0];
+        bytes_per_pixel = (m->bpp + 7) / 8;
+        for (i = 0; i < fbi->num_modes; i++, m++)
+                info->fix.smem_len = max_t(size_t, info->fix.smem_len,
+                                m->mode.xres * m->mode.yres * bytes_per_pixel);
+
+        res = request_mem_region(res->start, resource_size(res),
+                                DRIVER_NAME);
+        if (!res) {
+                ret = -EBUSY;
+                goto failed_req;
+        }
+
+        fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+        if (IS_ERR(fbi->clk_ipg)) {
+                ret = PTR_ERR(fbi->clk_ipg);
+                goto failed_getclock;
+        }
+
+        fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+        if (IS_ERR(fbi->clk_ahb)) {
+                ret = PTR_ERR(fbi->clk_ahb);
+                goto failed_getclock;
+        }
+
+        fbi->clk_per = devm_clk_get(&pdev->dev, "per");
+        if (IS_ERR(fbi->clk_per)) {
+                ret = PTR_ERR(fbi->clk_per);
+                goto failed_getclock;
+        }
+
+        fbi->regs = ioremap(res->start, resource_size(res));
+        if (fbi->regs == NULL) {
+                dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
+                ret = -ENOMEM;
+                goto failed_ioremap;
+        }
+
+        fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
+        info->screen_base = dma_alloc_writecombine(&pdev->dev, fbi->map_size,
+                                                   &fbi->map_dma, GFP_KERNEL);
+
+        if (!info->screen_base) {
+                dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
+                ret = -ENOMEM;
+                goto failed_map;
+        }
+
+        info->fix.smem_start = fbi->map_dma;
+
+        if (pdata && pdata->init) {
+                ret = pdata->init(fbi->pdev);
+                if (ret)
+                        goto failed_platform_init;
+        }
+
+
+        INIT_LIST_HEAD(&info->modelist);
+        for (i = 0; i < fbi->num_modes; i++)
+                fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
+
+        /*
+         * This makes sure that our colour bitfield
+         * descriptors are correctly initialised.
+         */
+        imxfb_check_var(&info->var, info);
+
+        ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
+        if (ret < 0)
+                goto failed_cmap;
+
+        imxfb_set_par(info);
+        ret = register_framebuffer(info);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to register framebuffer\n");
+                goto failed_register;
+        }
+
+        fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd");
+        if (IS_ERR(fbi->lcd_pwr) && (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER)) {
+                ret = -EPROBE_DEFER;
+                goto failed_lcd;
+        }
+
+        lcd = devm_lcd_device_register(&pdev->dev, "imxfb-lcd", &pdev->dev, fbi,
+                                       &imxfb_lcd_ops);
+        if (IS_ERR(lcd)) {
+                ret = PTR_ERR(lcd);
+                goto failed_lcd;
+        }
+
+        lcd->props.max_contrast = 0xff;
+
+        imxfb_enable_controller(fbi);
+        fbi->pdev = pdev;
+
+        return 0;
+
+failed_lcd:
+        unregister_framebuffer(info);
+
+failed_register:
+        fb_dealloc_cmap(&info->cmap);
+failed_cmap:
+        if (pdata && pdata->exit)
+                pdata->exit(fbi->pdev);
+failed_platform_init:
+        dma_free_writecombine(&pdev->dev, fbi->map_size, info->screen_base,
+                              fbi->map_dma);
+failed_map:
+        iounmap(fbi->regs);
+failed_ioremap:
+failed_getclock:
+        release_mem_region(res->start, resource_size(res));
+failed_req:
+failed_of_parse:
+        kfree(info->pseudo_palette);
+failed_init:
+        framebuffer_release(info);
+        return ret;
+}
+
+static int imxfb_remove(struct platform_device *pdev)
+{
+        struct imx_fb_platform_data *pdata;
+        struct fb_info *info = platform_get_drvdata(pdev);
+        struct imxfb_info *fbi = info->par;
+        struct resource *res;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        imxfb_disable_controller(fbi);
+
+        unregister_framebuffer(info);
+
+        pdata = dev_get_platdata(&pdev->dev);
+        if (pdata && pdata->exit)
+                pdata->exit(fbi->pdev);
+
+        fb_dealloc_cmap(&info->cmap);
+        kfree(info->pseudo_palette);
+        framebuffer_release(info);
+
+        dma_free_writecombine(&pdev->dev, fbi->map_size, info->screen_base,
+                              fbi->map_dma);
+
+        iounmap(fbi->regs);
+        release_mem_region(res->start, resource_size(res));
+
+        return 0;
+}
+
+static int __maybe_unused imxfb_suspend(struct device *dev)
+{
+        struct fb_info *info = dev_get_drvdata(dev);
+        struct imxfb_info *fbi = info->par;
+
+        imxfb_disable_controller(fbi);
+
+        return 0;
+}
+
+static int __maybe_unused imxfb_resume(struct device *dev)
+{
+        struct fb_info *info = dev_get_drvdata(dev);
+        struct imxfb_info *fbi = info->par;
+
+        imxfb_enable_controller(fbi);
+
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume);
+
+static struct platform_driver imxfb_driver = {
+        .driver         = {
+                .name   = DRIVER_NAME,
+                .of_match_table = imxfb_of_dev_id,
+                .owner  = THIS_MODULE,
+                .pm     = &imxfb_pm_ops,
+        },
+        .probe          = imxfb_probe,
+        .remove         = imxfb_remove,
+        .id_table       = imxfb_devtype,
+};
+module_platform_driver(imxfb_driver);
+
+MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
+MODULE_AUTHOR("Sascha Hauer, Pengutronix");
+MODULE_LICENSE("GPL");